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1.
Kinetics of the bis(2,2,6,2-terpyridine) iron(II)-cobalt(III) electron transfer reaction in sulfuric acid medium has been studied using stopped-flow spectrophotometry. The reaction is first order both in substrate and oxidant. Hydrogen ions accelerate the reaction, whereas bisulfate ions retard. A suitable mechanism is proposed considering Co3+, CoSO
4
+
and Co(SO4)
2
–
as the reactive oxidizing species.
(2,2,6,2-)(II)(III) . , , . , -. , Co3+, CoSO4 + Co(SO4)2 – .相似文献
2.
A study has been made on the oxidation of bis(2,2,6, 2-terpyridine)-iron(II), Fe(tpy)
2
2+
by manganese (IV) using stopped-flow spectrophotometry in H2SO4–H3PO4 mixtures. The reaction is first order in each the substrate and the oxidant. The rate of the reaction increases with hydrogen ion concentration. A plausible mechanism is proposed considering the protonated forms of manganese(IV) as reactive oxidizing species. The reaction obeys the rate law
相似文献
3.
Sai Chodavarapu Seshatalpa Hela Pamidipati Gayatri Sridhar Yeleswarapu Anipindi Nageswara Rao 《Transition Metal Chemistry》1998,23(3):249-252
The reaction of the Cr(xx)2(H2O)2
− (xx = oxalate, malonate and methylmalonate) complexes with dissolved CO2 was studied by stopped-flow spectrophotometry in the 7 < pH < 9 range and between 20 to 30°C at an ionic strength of 0.5
mol dm−3 (NaCl). Under the experimental conditions the aqua complex ion consists of a pH-dependent mixture of Cr(xx)2(H2O)2
−, Cr(xx)2(OH) (H2O)2− and Cr(xx)2(OH)2
3−. The monohydroxo and dihydroxo species undergo CO2 uptake and subsequent intramolecular carbonate ligand chelation independently, at rates which are readily distinguishable
and are governed by the uptake rate constants k
1 and k
2 and chelation rate constants k
3 and k
4, respectively. Only the k
1 values for oxalato, malonato and methylmalonato complexes could be calculated; k
1 = 1084 and 1333 and 1650 mol−1 dm3 s−1, respectively. The results obtained were compared with those obtained from other systems that have either cobalt(III), iridium(III)
or rhodium(III) as central atoms.
This revised version was published online in June 2006 with corrections to the Cover Date. 相似文献
4.
The kinetics of the reaction between monooxalatotetraaquachromium(III) and ethylenediamenetetraacetate have been studied in acidic media. The reaction is accelarated by nitrite and sulfite ions. The mechanism for the catalyzed reaction is discussed in terms of the formation of Cr(ONO)(ox)(H2O)3 and Cr(OSO2H)(ox)(H2O)3. The catalytic effect of sulfite is greater than that of nitrite. Spectral evidence is presented for the formation of nitrito and sulfito species.
() (III) . , . Cr(ONO)(ox)(H2O)3 Cr(OSO2H)(ox)(H2O)3. . .相似文献 5.
Tatakuntla Satyanarayana Nageswara Rao Anipindi Veeraputhiran Subbiah Madhusudan Waman Pandit 《Transition Metal Chemistry》1992,17(4):325-327
The rapid oxidation ofbis(2,4,6-tripyridyl-1,3,5-triazine)-iron(II), [Fe(TPTZ)2]2+, bytrans-1,2-diaminocyclohexanetetraacetatomanganate(III), [MnIII(Y)]−, in acetate buffers was monitored using stopped-flow spectrophotometry. The reaction is first order in the substrate and
evidence was obtained for pre-complexation between the oxidant and the substrate. The reaction rate increases as the pH increases.
Characterisation of the products using the radiotracers54Mn and59Fe indicated that [MnII(Y)]2− and [Fe(TPTZ)2]3+ are the final products. The reaction obeys the rate law:
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